Improved evaporator



J. BOGUE.

EVAPORATOR.

No. 49,851. Patented Sept. 12,l 1865.

UNITEDV STATES PATENT Oirlrrclt;i

JOHN BOGUE, OF AUBURN, WISCONSIN.

IMPROVEDEVAPORATOR.

Tofall whom t't may concern:

Be itknown that I, JOHN BOGUE, of Auburu,

inf'the county of Fond du Lac and State of Wis* cousin, have invented anew and useful Improvement in Evaporators; and I do hereby declare thatthe following is a full, clear, and exact description of the nature,construction, and operation ot' the same, reference being had to theaccompanying drawing, which is made part of this specification, and inwhich is rept'esented a sectional elevation ct'an evaporator embodyingmy invention. A

M y said invention consists ot' a oat of peculiar construction, employedto regulate the inti'ux ot' sap to the evaporating-pan.

The following description, with the aid of the drawing, will enableothers skilled in the art to which my invention appertains to fullyunderstand and use the same. n A represents the evaporating-pan, and Bthe walls which support it and inclose the tire.

' C isareservoir con taining the snp to'be evaporated, which owstherefrom into the evaporating-pan through the conducting-pipes D E, thelatter' of `which has avertical position over ythe pan A, and mayproject downward to a pointjust below the upper edge ot' said pan.

As the parts referred to are not the subject of my invention, theyinaybe constructed in any known or approved way.

F is a hollow oat, which may be circular, square, or of any other form.Rising from the center is a conical plug, j', which, when the iioat ishigh enough, closes the lower end of the pipe E, and thus prevents thesap from running into the pan., The height of the oat F is determined bythe height of the liquid in the pan, and whenin consequence of thedirniuuito'n produced by evaporation the liquid has fallen, the oat hasalso fallen, and the plugf being thus partially retracted from the pipeE, alloWs the iniiu'x of sap. By using the iioatit will be seen that thepan may always be made to contain a nearly uniform quantity of sap,which will be that best adapted for evaporation.

Heretofore the float has been made hollow and tight, so that the airWithin the same v which is expanded by the heated liquid must make toritself a ventage i'rom the Heat, in doing which the latter is crackedand a rentproduced which permits the sap to enter the float. float isthereby made heavy, and sinks or becomes detective in its operation.

In the oat here illustrated a snialltube,f, communicates with theinterior of the iiout and projects upward to a sutticient extent toprevent the entrance-of liquid through it. This tube aii'ords thenecessary ventag'e to prevent injury to the ioat by the heated air, andby its use the iioat is preserved in a perfect condition.

This device is of such a simple character that very little expense isinvolved in its application, and it admits ot' being,` constructedwithin a small compass, so as not to cover much Aot' thesurt'ace ot' thesap in theI pan.

Having now described m-y invention, the fol lowing is what I claim asnew, and desire to secure by Letters Patent:

l. 'lhearrangement ot the hollow tio-at F, plug f, tubes D and E,reservoir C, and pan A, substantially as described.

2. Constructingl the iioat with a vent-agetube, j", or au equivalentaperture, for the purpose explained.

JOHN BOGUE.

Witnesses Devin GUDEX, GRIN HELMER.

The.

